What is a "liner"?

Liner is a cosmetic product used for defining and enhancing the eyes or lips. It comes in various forms such as pencil, liquid, or gel, and is applied along the lash line or lip contour to create precise lines or shapes. Eyeliner is used to accentuate the eyes, making them appear more defined and expressive, while lip liner helps to shape and define the lips, preventing lipstick from bleeding or feathering. A liner is an essential tool in makeup application, allowing for artistic creativity and precision in enhancing facial features.